1D50.57 - Balls on a Hoop
Demonstrates centripetal forces
Gather hand-driven rotator and balls on a hoop demo. Attach hoop to rotator. Squeezee clamp the hand-driven rotator to the table for stability. Once pulled into the classroom, be sure to clamp down at least 2 wheels to stablize the cart for operation.
Spin the hoop by turning the hand-crank and observe the balls react to the centripetal force produced by the rotating object.
When spun fast enough the centripetal forces act strongly enough on the balls to counter act the force of gravity. This is because of the balls linear momentum traveling tangentially to the radius and angular velocity. The turning hoop will provide a max inward acceleration halfway up the hoop, thus there is a maximum height achieved no matter how fast the hoop rotates beyond this point.